If you call the number "n", then the expression would be "n+5".
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5 × d
3t = the number 3 times the number t. If you need a better answer, post more information.
A numerical expression in math terms has numbers and operations like for an example 1. 4+9 2. (8-2)+5
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It means that it is an expression, and it contains one or more variables. An "expression" is anything that can be calculated to obtain a number. For example, all of the following are expressions: 5 1 + 2 a a + 1 2a a + b